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Note 12 (Detail) (USD $)
 3 Months Ended 24 Months Ended 3 Months Ended
Jan. 31, 2013
Oct. 31, 2012
Apr. 30, 2011
Jan. 31, 2013
Common Class A [Member]
Fiscal Year to Date [Member]
Jan. 31, 2013
Common Class A [Member]
Life of the Issuance [Member]
Apr. 30, 2011
Initial [Member]
Apr. 30, 2011
Additional [Member]
Jan. 31, 2013
Minimum [Member]
Jan. 31, 2013
Maximum [Member]
Jan. 31, 2013
Fiscal Year to Date [Member]
Jan. 31, 2013
Life of the Issuance [Member]
Jan. 31, 2013
Tangible Equity Units [Member]
Tangible Equity Units, Units Issued in Period           3,000,000 450,000          
Tangible Equity Units, Rate 7.25%   7.25%                 7.25%
Subordinated Debt (in Dollars) $ 5,150,000 $ 6,091,000 [1]                   $ 5,200,000
Tangible Equity Units, Cash Installment, Per Note (in Dollars per share) $ 0.453125                      
Tangible Equity Units Rate Per Year 7.25%                      
Tangible Equity Units, Stated Amount (in Dollars per share) $ 25                      
Tangible Equity Units, Annual Interest Rate 12.072%                      
Tangible Equity Units, Number of Shares Upon Conversion, Per Unit               4.7655 5.8140      
Prepaid Stock Purchase Contracts Issued (in Dollars)                       $ 68,100,000
Tangible Equity Units, Number Converted                   600,000 2,200,000  
Prepaid Stock Purchase Contracts Shares Settled       2,700,000 10,400,000              
[1] Derived from the audited balance sheet as of October 31, 2012.